Camera with exposure meter



Dec. 19, 1939. GOLDHAMM'ER 2,133,763

CAMERA WITH EXPOSURE METER Filed May '7, 1936 In van for I By- Afforr w w Patented Dec.19, 1939 CAMERA WITH EXPOSURE METER Leo Goldhammer, Munich, Germany, assignor, by

mesne assignments, Binghamton, N. Y.,

to Agfa Ansco Corporation, a corporation of Delaware Application May '1, 19st, Serial No. 78,414

In Germany May 8, 1935 2 Claims. (Cl. 88-23) My present invention relates to a roll film camera. provided with an exposure meter.

One of its objectsis a roll film camera. in which an exposure meter has been built in so that an improved construction results. Further objects will be seen from the detailed specification following hereafter.

It has already been proposed to build photoelectric cells that is to say cells of the cuprous oxide type and the correspondingmeasuring instruments into roll film cameras.

According to the invention the casing of'the' these parts by a ledge or a cap. The cell is arranged vertically and the, galvanometer horizontally. By means of'a transparent scale and of a hand. bent at a right angle the instrument may beread in plan view or in elevation.

Details of the construction may be taken from the following description:

In the accompanying drawing, there is shown one embodiment oi the invention:

Fig. 1 is a front view of a roll film camera with a built-in photo-electric exposure meter.

handwhen looked at in direction of viewthere is provided a transparent, suitablybent scale II. The deflection of the hand can be observed on the scale ll through the magnifying lens [2 without one being forced to remove the camera from the eye. The scale 61) may be read through the window 6a of the cap I. The opening of the cell 4 may be adjusted by an iris-diaphragm l3 which is operated-by a milled ring It. By means of this diaphragm I 3 the opening of the camera-objective can easily be made to agree with the opening of the cell. A resistance l5 can x be provided in the circuit of the cell so as to be able to take into account a filter, the sensitiveness of the film etc. According to the sensitiveness of the used material more or less resistance is cut in by a slide I 6. When inserting a yellow filter before the objective, it is also possible to bring simultaneously a corresponding filter before the cell.

What I claim is: I

1. In a roll film camera in combination a casing having a narrow side wall, a cap on said wall, two spool chambers in said casing, a photo-electric exposure-meter comprising a photo-electric cell, 25 a measuring instrument, and a variable resistance, said measuring instrument comprising a directly readable scale in substantially parallel relationship with saidwall, a second scale forming an angle with thefirst named scale, a pointer 30 cooperating with said first scale and movable in 1 response to'the current of said cell, said pointer Fig. 2 is a plan view of the top narrow side of thecamera.

In the casing of the roll film camera I a space is provided between the spool chambers 2 and 3 for housing the blocking-layer cell 4, the finder 5 and the measuring instrument 6. The parts 4, I5 and 8 are suitably calibrated before mounting them in the camera, assembled and housed in own casings. The cap I which is provided with a window to covers the parts so that the outer form or the camera has no or only a slight bulge.

At the lower side of the spool chambers are two tripod screw nuts 8' and 9 with different screw threads. The nuts street the same length so that the camera can be set up edsewise uponthese nuts.

In order to be able to read the galvanometer 8 in plan and elevationalvlew. the endo: the handllisbentataflahtangle. Behindthe having its free end bent to make said end cooperate with said second scale, and optical means for observing said free end of said pointer and said second scale.

2. In a roll film camera in combination a casing having a narrow side wall, a cap on said wall, two

spool chambers in said casing, a photo-electric exposure-meter comprising a photo-electric cell, a variable diaphragm in front of said cell, a measuring instrument and a variable resistance, said measuring instrument comprising a directly readable scale in substantially parallel relationship with said wall, a second scale forming an angle with the first named scale, a pointer cooperating with said first scale and movable'in response to the current of said cell, said pointer having its free end bent to make said end oooperate with said secondscale, and optical means for observing said free end of said pointer and said second scale. 

